Optical disk device

1. A data-recordable optical disk device, comprising: test data recording means for recording test data in a predetermined area of an optical disk while varying recording power level; test data reproducing means for reproducing said test data, recording power level setting means for setting an optimum recording power level based on reproduced signal quality of said test data; data recording means for recording data based on said optimum recording power level; and strategy setting means for setting a recording strategy for said test data and said data; wherein when said optimum recording power level determined based on recording of said test data using a first recording strategy does not exceed an allowable recording power level, said strategy setting means sets said first recording strategy as a recording strategy for said data, and, when said optimum recording power level exceeds said allowable recording power level, said strategy setting means sets a second recording strategy as a recording strategy for said test data and said data, said second recording strategy having an optimum recording power level no higher than said allowable recording power level, and said second recording strategy requiring less recording power compared to said first recording strategy.

2. A data-recordable optical disk device defined in claim 1 , wherein said second recording strategy has an increased recording pulse time width compared to that of said first recording strategy.

3. A data-recordable optical disk device defined in claim 1 , wherein said strategy setting means sets said second recording strategy by increasing a recording pulse time width of said first recording strategy according to a difference between said optimum recording power level for said first recording strategy and the allowable power level.

4. A data-recordable optical disk device, comprising: means for recording test data on an optical disk while varying a recording power level, using a standard strategy which is determined based on a disk ID of said optical disk, and a low-power strategy requiring a less recording power compared to said standard strategy; means for reproducing the test data recorded using said standard strategy and said low-power strategy; means for selecting a first optimum recording power level based on reproduced signal quality of said test data recorded using said standard strategy; means for selecting a second optimum recording power level based on reproduced signal quality of said test data recorded using said low-power strategy; means for comparing said first optimum recording power level with an allowable power level; and means for recording data which records data using said first optimum recording power level when said first optimum recording power level does not exceed said allowable power level, and records data using said second optimum recording power level when said first optimum recording power level exceeds said allowable power level; wherein said low-power strategy is a strategy obtained by increasing time width of at least one pulse of said standard strategy.

5. A data-recordable optical disk device, comprising: means for recording test data on an optical disk while varying a recording power level, using a standard strategy which is determined based on a disk ID of said optical disk, and a low-power strategy requiring a less recording power compared to said standard strategy; means for reproducing the test data recorded using said standard strategy and said low-power strategy; means for selecting a first optimum recording power level based on reproduced signal quality of said test data recorded using said standard strategy; means for selecting a second optimum recording power level based on reproduced signal quality of said test data recorded using said low-power strategy; means for comparing said first optimum recording power level with an allowable power level; and means for recording data which records data using said first optimum recording power level when said first optimum recording power level does not exceed said allowable power level, and records data using said second optimum recording power level when said first optimum recording power level exceeds said allowable power level; wherein said low-power strategy is a strategy obtained by increasing number of pulses of said standard strategy.

6. A data-recordable optical disk device, comprising: means for recording test data on an optical disk while varying a recording power level, using a standard strategy which is determined based on a disk ID of said optical disk, and a low-power strategy reciuiring a less recording power compared to said standard strategy; means for reproducing the test data recorded using said standard strategy and said low-power strategy; means for selecting a first optimum recording power level based on reproduced signal quality of said test data recorded using said standard strategy; means for selecting a second optimum recording power level based on reproduced signal quality of said test data recorded using said low-power strategy; means for comparing said first optimum recording power level with an allowable power level; and means for recording data which records data using said first optimum recording power level when said first optimum recording power level does not exceed said allowable power level, and records data using said second optimum recording power level when said first optimum recording power level exceeds said allowable power level; wherein said low-power strategy is a strategy obtained by increasing a boost period of said standard strategy.

7. A data-recordable optical disk device, comprising: means for setting a strategy; means for recording test data on an optical disk using a standard strategy, wherein the standard strategy is determined based on a disk ID of said optical disk; means for reproducing said test data; means for setting a tentative optimum recording power level based on reproduced signal quality of said test data; means for comparing said tentative optimum recording power level with an allowable power level; and means for setting recording power level which sets said tentative optimum recording power level as an authentic optimum recording power level when said tentative optimum recording power level does not exceed said allowable power level, and, when said tentative optimum recording power level exceeds said allowable power level, performs re-recording of said test data and resetting of optimum recording power level by setting a low-power strategy requiring less recording power compared to said standard strategy until said tentative optimum recording power level becomes no higher than said allowable power level; wherein said low-power strategy is a strategy obtained by increasing time width of at least one pulse of said standard strategy.

8. A data-recordable optical disk device, comprising: means for setting a strategy; means for recording test data on an optical disk using a standard strategy, wherein the standard strategy is determined based on a disk ID of said optical disk; means for reproducing said test data; means for setting a tentative optimum recording power level based on reproduced signal quality of said test data; means for comparing said tentative optimum recording power level with an allowable power level; and means for setting recording power level which sets said tentative optimum recording power level as an authentic optimum recording power level when said tentative optimum recording power level does not exceed said allowable power level, and, when said tentative optimum recording power level exceeds said allowable power level, performs re-recording of said test data and resetting of optimum recording power level by setting a low-power strategy requiring less recording power compared to said standard strategy until said tentative optimum recording power level becomes no higher than said allowable power level; wherein said low-power strategy is a strategy obtained by increasing number of pulses of said standard strategy.

9. A data-recordable optical disk device, comprising: means for setting a strategy; means for recording test data on an optical disk using a standard strategy, wherein the standard strategy is determined based on a disk ID of said optical disk; means for reproducing said test data; means for setting a tentative optimum recording power level based on reproduced signal quality of said test data; means for comparing said tentative optimum recording power level with an allowable power level; and means for setting recording power level which sets said tentative optimum recording power level as an authentic optimum recording power level when said tentative optimum recording power level does not exceed said allowable power level, and, when said tentative optimum recording power level exceeds said allowable power level, performs re-recording of said test data and resetting of optimum recording power level by setting a low-power strategy requiring less recording power compared to said standard strategy until said tentative optimum recording power level becomes no higher than said allowable power level; wherein said low-power strategy is a strategy obtained by increasing a boost period of said standard strategy.

10. A data-recordable optical disk device, comprising: means for detecting intensity of a returned recording laser beam from an optical disk when recording data using a first recording strategy; control means for controlling recording power level such that said returned light intensity matches a target value; means for changing said first recording strategy to a second recording strategy requiring less recording power when a recording power level required for said returned light intensity to match the target value exceeds an allowable power level; means for storing a relationship between recording power level and reproduced signal quality for said second recording strategy; and calculating means for calculating a recording power level for said second recording strategy based on a recording power level for said first recording strategy; wherein said calculating means calculates, using said relationship, a recording power level which achieves reproduced signal quality under said second recording strategy equivalent to reproduced signal quality achieved at a recording power level under said first recording strategy.

11. A data-recordable optical disk device, comprising: means for detecting intensity of a returned recording laser beam from an optical disk when recording data using a first recording strategy; control means for controlling recording power level such that said returned light intensity matches a target value; means for changing said first recording strategy to a second recording strategy requiring less recording power when a recording power level required for said returned light intensity to match the target value exceeds an allowable power level; means for storing a relationship between recording power level and returned light intensity for said second recording strategy; and means for setting a new target value of returned light intensity for said second recording strategy; wherein said setting means sets said new target value using said relationship.